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<html>
  <head>
    <meta charset='utf-8'>
    <meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
    <meta name='mobile-web-app-capable' content='yes'>
    <meta name='apple-mobile-web-app-capable' content='yes'>

    <!-- Origin Trial Token, feature = WebXR Device API, origin = https://immersive-web.github.io, expires = 2018-08-28 -->
<meta http-equiv="origin-trial" data-feature="WebXR Device API" data-expires="2018-08-28" content="AnNpu7ceXvLew05ccD8Zr1OZsdZiB2hLQKK82kTTMDwF7oRKtP3QEJ4RzkeHrmB8Sq0vSV6ZNmszpBCZ0I8p9gAAAABceyJvcmlnaW4iOiJodHRwczovL2ltbWVyc2l2ZS13ZWIuZ2l0aHViLmlvOjQ0MyIsImZlYXR1cmUiOiJXZWJYUkRldmljZSIsImV4cGlyeSI6MTUzNTQxNDQwMH0=">

    <title>Phone AR</title>

    <link href='../css/common.css' rel='stylesheet'></link>

    <!--The polyfill is not needed for browser that have native API support,
        but is linked by these samples for wider compatibility.-->
    <!--script src='https://cdn.jsdelivr.net/npm/webxr-polyfill@latest/build/webxr-polyfill.js'></script-->
    <script src='../js/xrray-polyfill.js' type='module'></script>
    <script src='../js/webxr-polyfill.js'></script>

    <script src='../js/webxr-button.js'></script>
  </head>
  <body>
    <header>
      <details open>
        <summary>Phone AR</summary>
        <p>
          This sample demonstrates use of a non-exclusive XRSession to present
          Augmented Reality content.
          <a class="back" href="./index.html">Back</a>
        </p>
      </details>
    </header>
    <script type="module">
      import {Scene} from '../js/cottontail/src/scenes/scene.js';
      import {Renderer, createWebGLContext} from '../js/cottontail/src/core/renderer.js';
      import {Gltf2Node} from '../js/cottontail/src/nodes/gltf2.js';
      import {QueryArgs} from '../js/cottontail/src/util/query-args.js';
      import {Node} from '../js/cottontail/src/core/node.js';
      import {RayNode} from '../js/cottontail/src/nodes/ray-node.js';
      import {FallbackHelper} from '../js/cottontail/src/util/fallback-helper.js';

      // If requested, initialize the WebXR polyfill
      if (QueryArgs.getBool('allowPolyfill', false)) {
        var polyfill = new WebXRPolyfill();
      }

      // Debug constants.
      const visualiseOrigin = false;
      const visualiseFloorSpace = false;

      // XR globals.
      let xrButton = null;
      let xrRefSpace = null;
      let xrFloorSpace = null;

      // WebGL scene globals.
      let gl = null;
      let renderer = null;
      let scene = new Scene();
      let solarSystem = new Gltf2Node({url: '../../media/gltf/space/space.gltf'});
      // The solar system is big (citation needed). Scale it down so that users can
      // move around the planets more easily.
      solarSystem.scale = [0.1, 0.1, 0.1];
      scene.addNode(solarSystem);

      // Visualise the origin.
      if(visualiseOrigin) {
        let xRay = new RayNode({direction : [5, 0, 0], baseColor : [1, 0, 0, 1]});
        let yRay = new RayNode({direction : [0, 5, 0], baseColor : [0, 1, 0, 1]});
        let zRay = new RayNode({direction : [0, 0, 5], baseColor : [0, 0, 1, 1]});

        scene.addNode(xRay);
        scene.addNode(yRay);
        scene.addNode(zRay);
      }

      // Visualise the floor space.
      let floorSpaceNode = new Node();
      floorSpaceNode.visible = false;

      if(visualiseFloorSpace) {
        let xRay = new RayNode({direction : [5, 0, 0], baseColor : [1, 0, 0, 1]});
        let yRay = new RayNode({direction : [0, 5, 0], baseColor : [0, 1, 0, 1]});
        let zRay = new RayNode({direction : [0, 0, 5], baseColor : [0, 0, 1, 1]});

        floorSpaceNode.addNode(xRay);
        floorSpaceNode.addNode(yRay);
        floorSpaceNode.addNode(zRay);
      }

      scene.addNode(floorSpaceNode);

      // No skybox is added to this scene, and we're not clearing the background to
      // black because we want the real world to show through.
      scene.clear = false;

      function initXR() {
        xrButton = new XRDeviceButton({
          onRequestSession: onRequestSession,
          onEndSession: onEndSession,
          textEnterXRTitle: "START AR",
          textXRNotFoundTitle: "AR NOT FOUND",
          textExitXRTitle: "EXIT  AR",
          supportedSessionTypes: ['immersive-ar']
        });
        document.querySelector('header').appendChild(xrButton.domElement);
      }

      function onRequestSession() {
        // Requests an inline (non-immersive) session with environment integration
        // to get AR via video passthrough.

        // Test the new XRSessionInit dictionary by asking for a nonexistent
        // optional feature. This should be silently ignored.
        let options = {
          requiredFeatures: ['local-floor'],
          optionalFeatures: ['unicorns-and-rainbows'],
        };

        // Even though this is a non-immersive session, the fact that it's
        // using environment integration means it must be requested in a user
        // activation event so that appropriate permissions can be granted.
        // This will likely prompt the user to allow camera use, so the promise
        // may remain outstanding for a while.
        navigator.xr.requestSession('immersive-ar', options).then((session) => {
            session.mode = 'immersive-ar';
            xrButton.setSession(session);
            onSessionStarted(session);
        });
      }

      function onSessionStarted(session) {
        session.addEventListener('end', onSessionEnded);

        if (!gl) {
          gl = createWebGLContext({
            xrCompatible: true
          });

          renderer = new Renderer(gl);

          scene.setRenderer(renderer);
        }

        session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) });

        session.requestReferenceSpace('local').then((refSpace) => {
          session.requestReferenceSpace('local-floor').then((floorSpace) => {
            xrRefSpace = refSpace;
            xrFloorSpace = floorSpace;

            session.requestAnimationFrame(onXRFrame);
          });
        });
      }

      function onEndSession(session) {
        session.end();
      }

      function onSessionEnded(event) {
        xrButton.setSession(null);
      }

      // Called every time a XRSession requests that a new frame be drawn.
      function onXRFrame(t, frame) {
        let session = frame.session;
        let pose = frame.getViewerPose(xrRefSpace);

        let floorSpacePose = xrFloorSpace ? frame.getPose(xrFloorSpace, xrRefSpace) : null;

        if(floorSpacePose && visualiseFloorSpace) {
          floorSpaceNode.matrix = floorSpacePose.transform.matrix;
          floorSpaceNode.visible = true;
        } else {
          floorSpaceNode.visible = false;
        }

        scene.startFrame();

        session.requestAnimationFrame(onXRFrame);

        scene.drawXRFrame(frame, pose);

        scene.endFrame();
      }

      // Start the XR application.
      initXR();
    </script>
  </body>
</html>
